import java.util.Scanner;

public class homework14 {

        public static void main(String[] args) {
            Scanner in = new Scanner(System.in);
            System.out.print("输入一个整数:");
            int number = in.nextInt();
            for(int i=2;i<=number;i++){
                if(isPrime(i)){
                    System.out.println(i);
                }
            }
        }
        public static boolean isPrime(int n){
            for(int j= 2;j < n;j++){
                if(n % j ==0){
                    return false;
                }
            }
            return true;
        }
    }

